3-Substituted- 7-dialkylamino-spiro(2H-1-benzopyran-2,3'-(3H)-na

Details 3-Substituted- 7-dialkylamino-spiro(2H-1-benzopyran-2,3'-(3H)-na 3-Substituted- 7-dialkylamino-spiro(2H-1-benzopyran-2,3'-(3H)-na

1981-10-22

1983-05-17

Chan, Nicky

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

549344, C08F23402, C07D31196

Patent

active

043840949

ABSTRACT:
Substituted spiro 2H-1-benzopyran-2,3'-(3H)-naphtho(2,1-b)pyrans particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

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patent: 4029677 (1977-06-01), Baumann et al.
patent: 4110348 (1978-08-01), Baumann et al.
patent: 4348508 (1982-07-01), Herweh et al.
Feichtmayr et al., Liebigs Ann. Chem., 1979(9), 1337-1345.

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